The Chicago Bears produced the NFL's eighth-best passing defense last season, but they're down a man heading into 2013.

Cornerback Kelvin Hayden will miss the entire season with a torn hamstring, the team announced Wednesday. The eight-year pro will undergo surgery, stripping the Bears of their presumed nickel man. Hayden accounted for 37 tackles and an interception last season in two starts. He got 472 snaps -- mostly in defensive subpackages -- and that number was likely to increase in 2013.

Brooks: Chicago hope

Bucky Brooks explains how new
Bears boss Marc
Trestman will maximize Jay
Cutler and Matt Forte in an avant-garde attack.
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